Independent rotation for percussive tools



Patented pr. 10, 1923.

ras

1,451,362; ATENT orric.

CHARLES C. HANSEN, F EASTON, PENNSYLVANIA, ASSIGNOR TO INGERSOLL-RAND COMPANY, OF JERSEY CITY, NEW JERSEY, A CORPORATION OF NEW JERSEY.

Application 'mea April 7, 1922.v serial No. 550,421,

plify andreduce Vthe cost of` constructing and assembling the rotation motor on the drill cylinder, enable the motor to be conveniently and readily mounted at the back end ofthe cylinder, and produce a construction b-y means of which the motor may be secured and supported at the side of the cylinder, by means of longitudinal bolts.

Further objects of theinvention will hereinafter appear and the invention is shown in one of itsl preferred forms in the accompanyingdrawings, in which,-

.Figure l is a sideelevation partly broken away and partly in longitudinal sectionl of so much of a rock drill as will serve to illustrate the invention.- p

Figure 2 is a horizontal sectional plan view on the line 2-2-of Figure l, and Y Figure 3 is a detail transverse sectional view of the mot'or on the'lineB- of Figure 2 looking in the direction of the arrows. v v o Referring to the drawings, the cylinder A is provided with a fluid actuated'reciprocating hammer piston B of any suitable type,

and the drill steel C extends into the fronthead D in positionkto receive the impact blows of the piston. Motive fluid for operating the piston is supplied to the machine at the inletE controlled by the throttle valve F in the back head G and the cylinder A, front head D and back head G are held together by the usual sideboltsH.

Rotation is imparted to -the drill steel C by means of a rotation motor, in this instance shown as a rotary gear motor, having the gears J and KV suitably mounted in a motor casing L, which is adapted to be removably mounted at the side of therear` The objects of the invention are to sim-v wardend of the cylinder A and oneof the 55 gears, as the gear K is operatively connected to rotate the drill steel through suitable driving connections. A yIn accordance with this invention, the' cylinder is formed with a reducedextension 00 O and a projection'forming a shoulder P at the rearward end of thegcylinder, located forwardly of the back end of the-cylinder extension and formedwith a plane face. l j The motor casing L, as shown, is open 'at the front end and preferablyprovided with an integral backl head R, although the backk head could be a separate plate if desired. They r open end of the motor casing y,L is adapted to be secured against the plane face orsurface of Ithe lprojection P on the cylinder, which thereby forms onehead of the .motor casing. The motor casing is thus located adjacent or in proximity tothe cylinder ex-y tension O, and in accordanceV with my construction, the motorl casing does not bear upon the cylinder extension, but a space S is left between the bottom ofthe motor casing and the cylinder extension, .whichper-` f mits the motor to exhaust through the exhaust openings T into'the space S beneath the motor, and from thencey to atmosphere through the space or passage S', between the back head G andthe motor casingfi Fluid pressure is supplied to the motor casing through the admission port U from a port V' in the back head Gr .communicating with the supply controlled by the-throttle valveF; rIhe construction described avoids the ne- 490 cessity of machining the surfacel of the cylinder extension O beneath -the motor, and y requires only that the plane surface or face ofthe cylinder projection P be machined toiy form a tightfit with the motor casing. f Theb motor casing is readily secured and centered? upon the cylinder projection P as by means of longitudinal bolts W passing through the motor casing and the cylinder projection, and by this means the bolts are better/10o able to resist longitudinal strains. y n The cylinder back head Gr is suitably centered over the back end of the cylinder eX- tension O in any suitable manner, in this instance theback head Gr being providedwith the iange X, only a portion of which is shown for illustrative purposes. The back head Gy, forms a back head for the cylinder 4and also which theshaft extendsl extends outwardly over the motor casing, and a suitable packing Y may be provided between the back head Gr and the motor casing, to connect the port V in the back head with the portv or passage U in the motor casmg.

The gears J and K' are preferably interchangeable and each providedwith key-ways a, so that either of the driving sha-ft, as by means of a key c. The gearf- J rotates on roller bearingsl Z on the` stationary shaft e having bearings in the motor casing, and cylinder projection respectively. The kdriving shaft isv prefer- 'ably for-'ined in sections Z) and flsuitably coupledif together as by means ofy the undercut and, overlappingportions g and It, and a loose sleeve y' yis-placed over-the shaft and extends overthe coupling members within the chamber 7d, in the cylinder A through The shaft section b rotates' in a roller-bearing 0 in the back headiR-Of the motor; casing, and in arollerbearing-p carried inthe bushing g inl the body portion` ofthe cylinder. Shaft section f" rotates inv the roller-bearing r carried in thebushi'ngsV at the forward end of the cylinderk body. Slight"A clearanceis provided between the ends of the shaft sleeve j and 'the roller-bearing bushings g and s so that wheniv the motor casing and motor gears are removed7 from the machine, thus separating the shaft section b' fromk the shaft section but leaving-the roller-bearing p in position, the sleeve y' may be utilized to push the roller-bearing p from the bushing g.` Qbvio1'1sly,laft er the front head l) ofthe machine has, been removed, and the parts connected therewith, including the rollerbearing r, 'a toolmay be inserted against the shaft sleeve j to push the sleeve longitudinally.: Suitable` gear connections are providedffor' transmitting rotation from the driving' shaft of the motor tothe drill steel,

andA for this purpose, the shaft section` f' is lprovided withl a pinion t meshing with a gear u, having a pinion o meshing with a gear.,I w, which is suitably ysecured as by means of screw. threads, 00 to the chuck g/ forfrotatingjthev.chuck. A chuck sleeve e isv i Pfferably inserted within, the back end of the n chuck, and f the chuck bushing y 2 is insertedgkinrlthe chuck against the chuck sleeve z.

The chuck y` is .suitablyclutched to the chuck keyr 3xl and rotation is impartedr to the drill steel' through the agency ofthe; usual lugs l onthewshank of thelsteel, which engage the chuck. y. Within the front endof the cylinderiispreferably located-the front cylinder bushingA 5, through` which the forwardv extensionoff thepistonB reciprocates, and in order; toy prim/ide` air for blowing down through the drill. steel, the piston extension 6 is preferably formed with several grooved Gear or any gear of this construction, may Je keyed tothe section b or attened portions 7 so that air may blow through said grooves or flattened portions from thel cylinder when said grooves enter the cylinder as the piston moves to the end of its rearward stroke.

I claim:

1. fluid actuated percussive tool having a cylinder and ai piston adapted to operate therein, and a motor operatively connected to rotate the drill steel, said cylinder having a projection at its rearward end formed with a plane face, said motor having a casing open at the front end and adapted tol be removably secured against the-face of said projection which thereby forms one' head of the motor casing, longitudinal/bolts for securing the motor casing against the face'I of said projection, a back head for the cylinder extending outwardly overv the motory casing, and means fory clamping the back head to the cylinder.

2'. A fluid actuatedpercussivetool having a cylinder anda piston adapted to operate therein, and a motor operatively connected' to rotate the drill steel, said cylinder havingI a reducedV rearward extension andI a projection forwardly of the backend of said extension formed with a plane face, said motor having a casing open at the frontend and adapted to be removablysecured adjacent the cylinder extension andA against the facer of said projection which' thereby forms one' head of the motor casing, longitudinal bolts for securing the motor casingl against thet face of said projection, a back head for'the cylinder extending outwardly overA the motor casing, and means for clamping the backA head to the cylinder.

3. Aluid actuated :percussive tool "having a cylinder and aV pistony adapted tol operate therein, and a motor operatively connected to rotate the drill steel, saidk cylinder having a reduced rearward'extension and a projection forwardly of the back end of'said eX= tensiony formed with a plane face, saidfmotor havinga casing open at the front'ren'dv4 and adapted to be removably secured' against' the faceV ofV said projection without bearing upon the cylinder extension, the projection forming one head of the motor casing, longitudinall bolts for securing and supporting-the motorcasing in position against the face ofl saidprojection, a back head for the cylinder: extending outwardly over the motor casing; and means for clamping the back head tothe cylinder. j

4:. A ll'uid actuated percussive tool having a cylinder and a piston-adapted to operate therein, and amotor operatively connected to rotate the drill steel,` said cylinderhavinga. reduced rearward extension anda projection forwardly of theback end ofsaid extension formed with'fa plane face, said motor having casing. open at thev frontend and adapted to be removably secured againstA the face of said projection without bearing upon position against the face of said projection,

the cylinder extension, the projection forma back head for the cylinder extending outing one head of the motor casing, exhaust wardly over the motor casing, and means for 10 apertures in the motor casing leading to the clamping the back head to the cylinder.

5 space between the motor casing and the cyll'n testimony whereof I have signed this inder extension, longitudinal `bolts for sespecification.

curing and sup1` ortingthe motor casing in CHARLES C. HANSEN. 

